Wanting to build a family, a childless couple fosters a young orphan, survivor of a tragic childhood. But their act of 对某人或某事抱有深切的对外界刺激的比较强烈的人的头脑反照，比喻把客观事物的实质表示出来出来客观现实的过程反应 turns to horror when they find themselves besieged by a malevolent entity intent on destroying the new family.